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RGM belt drive

Discussion in 'Other Norton Motorcycles' started by seattle##gs, Aug 7, 2019.

  1. seattle##gs

    seattle##gs

    Joined:
    Oct 28, 2014
    I have an 850 in an atlas frame. The motor is very hard to kick over and I am wondering if perhaps the belt drive is contributing. Possibly from the pulley dimensions? Just a theory. I have installed the MK3 kickstart lever which helped slightly. Everything turns freely. anybody run into this when installing the RGM belt drive? It is a good unit and no problems with it I am just wondering if it requires a bit more force to kick it over.
     
  2. swooshdave

    swooshdave

    Joined:
    Apr 15, 2009
    The only way the belt drive could have an effect is if it was too tight. If you have it too tight will break and then be too loose.
     
  3. seattle##gs

    seattle##gs

    Joined:
    Oct 28, 2014
    It has slack. I thought there might be a difference in pulley size which might affect the ratio between gearbox and front engine sprocket and maybe have an effect on the amount of pressure needed to kick it over. Just trying to rule out possibilities.
     
  4. swooshdave

    swooshdave

    Joined:
    Apr 15, 2009
    How fresh is the motor? What is your kicking technique?
     
  5. seattle##gs

    seattle##gs

    Joined:
    Oct 28, 2014
    The motor is very new. Been kicking over Nortons for 40 years. I stand on the right side, bike on center stand, lever at 9 o'clock.
     
  6. bill

    bill

    Joined:
    Jun 1, 2003
    it depends on the ratio. a std. commando is 2.19-1 and the RGM is 2-1 for a commando. the overdrive of the RGM will make it slightly easier to kick. what is the ratio on your drive?
     
  7. swooshdave

    swooshdave

    Joined:
    Apr 15, 2009
    So 40 years the hard way.

    Try this. Do this first on the center stand and you can soon move off the stand.

    Straddle the bike. Use the kickstarter and find TDC, you’ll feel the pressure. Now push the Kickstarter slowly until you feel the pressure reduce. Bring the Kickstarter back to the top. Assuming your carb is prepped and ignition now on, kick through to the ground in one motion.

    The weight of the pistons and the advantage of momentum will spin the engine.

    Don’t get me wrong, getting past TDC with a fresh engine is not easy but in the end it’s easier than trying to kick past TDC.
     
  8. texasSlick

    texasSlick VIP MEMBER

    Joined:
    Jan 2, 2013
    +1

    Slick
     
  9. robs ss

    robs ss VIP MEMBER

    Joined:
    Aug 16, 2016
    I have a Bob Newby clutch/belt systems for my 650ss and 500 single - the are both 2:1
     
  10. seattle##gs

    seattle##gs

    Joined:
    Oct 28, 2014
    I don't know the ratio. Whatever is stock from RGM
     
  11. ashman

    ashman

    Joined:
    Jul 11, 2010
    Maybe with the fresh motor it might be a bit tight and needs time to loosen up a bit, has it been run much since the rebuild could also be to much oil on the pistons and rings when installed, my Norton is high compression motor and my piston to bore was very tight clearance as well final hone, it took a very long time to loosen up a bit, even today my mates can't kick it to life but I get it first kick every time, getting the knack right is very important if its a tight motor.

    Ashley
     
  12. robs ss

    robs ss VIP MEMBER

    Joined:
    Aug 16, 2016
    Count the teeth on the pinion and clutch and divide the two - I suspect it will be near to 2:1 - if not something"s wrong
     

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